Implementing of Active Crossover Network after change the Mode from Aleph Power Amp

If I transform any Aleph model from the non inverted mode to the inverted mode, it is easy to implement an active crossover network with 12db/oct (only MFB resp. Multiple Feedback topology, not the Sallen-Key topology).
Are there any experiences in this matter?
Here an URL:Design and Dimensioning of Active Filters
Cause the lower open loop gain in opposite to typical OP-AMP's there must be some additional design rules.